Hot-air furnace



(No Model.) 2 sheets-Sheet 1.

A. H. BROWN.

HOT AIR PURNAGE.

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@itmsse ATTOPQQEY.

N. PETERS, PholwLilmgnm'ef. washington, D. C.

No Model.)

2 sheets-'sheet 2. A. lH. BROWN.

HOT AIR FURNAGE.

UNITED l STATES PATENT OFFICE.

ABNER H. BROWN, OF ROYERS FORD, PENNSYLVANIA.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 248,016, dated October 11, 1881.

Application filed May 4, 1881.

To all Iwhom it may concern: Y

Be it known that I, ABNER H. BROWN, a

'citizen ot' the United States, residing at Royers is a horizontal section in line y y, Fi'g.3.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to that class of furnaces in which the products of combustion are carried off by an indirect draft.

The said invention consists in the peculiar construction, combination, and arrangement Y I .G represents a iue, which rises from the anof the drum, dome, tlues, and chambers through' which the products of combustion pass, whereby a great amount of heating-surface is obtained, as hereinafter set forth.

Referring to the drawings, A represents the combustion-chamber or body of the heater; and B represents a drum,which comm unicates with said chamber by means of fines C, the drum having connected toits top and bottom sheets a number of pipes, D, which are open at both ends. 1n the top vof the drum is an opening, E, which connects the interior of said drum with adome, F, which islocated above the drum. The dome F is of triangular or winged form, and with two of its limbs or wings are connected fines G, which pass downwardly and communicate-with a horizontally-arran ged annular flue, H, surroundin g the base of the chamber or body A.

nular iue H and communicates with the pipe a, which leads to the chimney, and also communicates with the remaininglimb or wing of the dome F, said iiue G' having a damper, b, which is located above the place of connection ot the pipe a.

Surrounding the combustion-chamber and lues G G is ajacket, J, which is open at top and bottom, and is supported on the walls of the annular ue H or by other suitable means,

(No model.)

and surrounding said'jacket is a casing, K, which is open at top and bottom, and is properly supported on the base ofthe furnace. The casing K is surrounded by the exterior casing, L, ofthe furnace, it being noticed that spaces exist between the jacket and inner casing and between the inner and outer casing, and that thejacket and inner casing are perforated at their lower portions.

1n making the fire the damper b may be opened, so that the smoke, &c., passes to the chimneythrough the pipe a, it being noticed that the smoke, &c., from the chamber A enters the drum B .through the lues C and enters the domeF through the liuc E, and reaches the top of the Itlue G', from whence it passes to the pipe a. The damper is duly closed, and theproducts of combustion then leave the dome F and descend the fines G, and reaching the annular iiue or radiator H pass through the same and escape therefrom upwardly through the flue G to the pipe a, communicating with the chimney. The fresh air admitted through the open base of the heater passes the annular iiue or radiator H and is heated thereby, and entering thejacketJ comes in contact with the hot flues G G', where it is further heated. 'Some air ascends the space between the jacket J and inner casing, K, and unites with that from within the jacket J, and then circulates around the heated flues C and enters the heated pipes D of the drum B, from whence it is directed against and around the hot dome F, and being thus additionallyY heated enters the hot-air space A.

two casin gs K L and reaches the hot-air space A', and in its passage keeps'the outer casing in a cool condition, whereby it is evident that there is no loss of heat through said casinginto the cellar or apartment containing the furnace.

Owing to the perforations ot' the jacket J some of the hot air within the same enters the space between said jacket and the inner cases, and thus creates a draft in said space, whereby a greater quantity of fresh air is taken into the same. Some of the heated air passes through the perforations of theinner casing, K, into the space between said casio g and the outer casing, whereby an increased volume of fresh air is taken in said space, the heating capacity of the furnace being thus increased Fresh air also enters the space between the IOC and the temperature of the outer casing kept comparatively low.

It will be noticed that the products of combustion are passed through the various flues, drum, and dome, and by an indirect or downward draftinto the supplementalannularchamber or radiator below, then through the same to the upwardly-discharging flue, from whence they ascend to the pipe a. Gonsequen tly l provide a large heating-surface and obtain from the products of combustion heat which is ordinarily lost, but which I save by passing' it by the indirect draft and extracting its valuable qualities before reaching the exit-pipe leading to the chimney.

An additional feature presented by me is the passage of the products of combustion from the chamber A to the outer part of the drum B, then to the center of the dome and thence to the circumference, where they reach the downward-draft flues G G, so that said products traverse the entire extent ot' the drum and dome before leaving.,r them, and thus thoroughly heat said drum and dome.

The dome F is accessible for cleaning purposes by means of the cap c, the drum B by means of the cap d, and the bottom radiator by means ofthe cap c, said caps being removably fitted on short branch pipes communicating with the respective parts.

In the drawings the currents of air are indcated by small arrows, and the currents of products of combustion by large arrows.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patentis- 1. Annular bottom radiator, H, in combination with dome F, drum B, combustionchamber A, draft-tlues G, leading from said dome down to said radiator, and the independent draft-flue G', leading from said radiator to the outlet and extending to the dome, said draftilue being provided with damper b, substantially as and for the purpose set forth.

2. The combustion-chamber, in combination with the drum B, dome F, iiues G G, bottom radiator, H, flue G', and exit-pipe a, substantially as and for the purpose set forth.

3. rlhe furnace having ajacket, J, and a surrounding casing, K, substantially as and for the purpose set frtll.

4. Thejacket J, a surrounding inner casing, K, and an exterior casing, L, in combination with the furnace, said jacket and inner casing being perforated, substantially as and for the purpose set forth.

ABNER H. BROWN.

Witnesses:

JOHN A. WIEDERSHEIM, F. Coornn. 

